Safety control



Sept. 2, 1941.

R. E. ZERUNEITH SAFETY CONTROL 7 sheets-smeet 1 Filed Aug. 14, 1959 .l Il i l l l l I I l llllnllllll Sept. 2, 1941. R. E. ZERUNEITH SAFETYCONTROL Filed Aug. 14, 1939 7 ASheets-Sheet 2 www RJEZeruneL Sept. 2,1941. R E ZERUNElTH 2,254,256

SAFETY CONTROL Filed Aug. 14, 1959 7 Sheets-Sheet 3 Sept-2,1941- Y R. EzERUNElTl-l 2,254,256

- SAFETY oNTRoL Filed Aug. 14, 1959 '7 sheets-sheet 4 Sept 2, 1941. R.E. ZERUNEITH Y 2,254,256

` SAFETY CONTRQL Filed Aug. 14, 1959 7 sheets-sheet 5 R.EZ ra/,hei Zh am94M Sept. 2, 1941.

. R. E. ZERUNEITH SAFETY CONTROL 7 Sheets-Sheet 6 Filed Aug. 14, 1939Sept. 2, 1941. R. E. zERUNL-:ITH

SAFETY CONTROL Filed Aug. 14, 1959 7 Sheets-Sheet 7 www www

, 3mm ze'run ez'/ Patented Sept. 2, 1941 NT'ED STATES PATENT OFFICE l A2,254,256`

saumurA` CONTROL Rudolph E. zeruneith, New Your, N. Y. ApplicationAugust 14, 1939, seriaiivo'. 290,031

s claims. (c1. 192-137) This invention relates to a safety control foruse 1n connection with power driven machines,

in general but more particularly for employment with wire stitchingmachines of that type for forming and driving wire staples.

The invention aims to provide, Yin a manner as hereinafter set forth, asafety control automatically discontinuing the operation of the ma- `soconstructed and arranged to provide forA the inactivity of a drivingbelt relative to a mechanism driven thereby when an element of the Icontrol meetswith an obstruction disposed in the path of the operativestroke of a reciprocatory element of said' mechanism whereby theoperation of the latter is discontinued.

A further object of the invention is to provide,

in a manner as hereinafter set forth, a safety L control including meansto cause the disconnecting of a driving structure from a drivenstructure when an element of'control meets with an obstruction disposedin the operative stroke of a reciprocatory element of the drivenstructure thereby discontinuing the operation of the driven structure.

A further object of the invention is to provide, in va manner ashereinafter set forth, a safety control for stalling a driving motor forthe driven structure when an element of the control meets with anobstruction disposed in the'f path of the operative stroke of areciprocatory element of the driven structure whereby the` Operation ofthe driven structure is discontinued. Y

Further objects of the invention are to provide, in a manner'ashereinafter set forth, a safety control for the purpose referred towhich is comparatively simple in its construction and arrangement,strong, durable, readily installed with respect to .s themachine withwhich itis to be used, automatic` in its action," thoroughly efcient inits use, readily assembled, and comparatively inexpensive vto set up.

' Embodying the objects aforesaid and Vothers which may hereinafterlappear, the invention consists of the novel construction, combinationand arrangement of partsy as willV be more specifically referred to andshown inthe accompanying Y Y drawings, wherein are illustratedembodiments of with said driven structure of still another modi- CilltheinventionQbut it is to be understood'lthat tion and partly in `frontelevation showing vthe adaptation therewith of an explorer forming anelement of the control and further illustrating in fulland dotted linesrespectively the starting andthe lowest position of the explorer liftingmember,

Figure 3 is a fragmentary view in side elevation and vertical section,of a machine showing the adaptation of the control with respect to theoperating mechanism for the staple forming element of ,the machine, A yFigure 4 is a diagrammatic view of the power circuit related to anactuating solenoid forming an element of the control, l

Figure 5 is a` fragmentary View in longitudinal section of a wirestitching machine showing the adaptation therewith' of a modified formof safety control in accordance with this invention,

Figure 6 is a lfront elevation of the control shown in Figure 5, andillustratingv its arrangement inY relation to the driven structure ofthe machine,

Figure 'l is afvertical sectional view illustrating the driven structureof the machine in Figure v6V connected to the driving structure by aball tion of an element of the structure shown in ,Figuref Figure 10 isasectional detail illustrating the driving structure and drivenvstructure of the machine shown in Figure` 6 connected together by asingle tooth clutch,

'Figure 11"is'a side elevation of the structure shown in Figure 10, y

vFigure 12 Vis a fragmentary view in longitudinal section of a machineincluding a driven structure and furtherl Vshowing the adaptation fiedform of safety control in accordance with this invention,

Figure 13 is a front elevation of the modified form of control shown inFigure 12 arranged in relation with the stitching head of the wirestitching machine,

Figure 14 is a section on line I4-I4 Figure 13,

Figure 15 is a section on line I5-I5 Figure 13,

Figure 16 is an elevation of an explorer forming an element of thecontrol shown in Figure 15 and looking in a direction towards the outerside edge of the controller,

Figure 17 is an elevation looking towards the cam surface of theslidably mounted clutch member forming element of the driven structureof the machine shown in Figure 12,

Figure 18 is a top plan view of the development of the cam surface forthe shiftable clutching member shown in Figure 12,

Figure 19 is a fragmentary view in longitudinal section of a wirestitching machine showing the adaptation therewith lof still anothermodified form safety control, in accordance with this invention and withthe control shown in side elevation, and

Figure 20 is a front elevation'of the control shown in Figure 19 asapplied to a wire stitching machine.Y

With reference to Figures 1 to 4 of the drawings, I generally indicatesa wire stitching machine for forming and driving staples and 2designates the staple forming element of the machine. The element 2 isreciprocated by an operating mechanism 3 carried by a driven shaft 4carrying a driven pulley 5 operated from a transmission belt 5travelling around a drive pulley l mounted on a drive shaft 8 operatedfrom a motor 9 supported on the top of the machine. Y

The control as designated by Figures 1, 2 and 3 includes an -explorer Iformed of a shank I I and a foot I2. The shank II is disposed at'oneside of the staple forming element and lis also bodily carried upwardlyby the latter on aV portion of the upstroke of said element. The foot i2is disposed in the operative path'or downstroke of theV element 2 Theexplorer is spring urged for the purpose of normally moving the footY I2the desired distance below the lower end of the element?, and whichwould be the work line. For the purpose of urging the explorer into theposition as stated an'urging spring I3 is employed. The spring I3 ismounted in a socket ifi formed in the body of the stitching head of themachine. The upper portion of the socket I4 is of less area thanits'lower'portion' and. extending in said lower portion is the upperportion of the shank I I. The latter in its upper end is formed with asocket I5 for receiving the lower end of the spring I3. The explorer IDacts to explore the operative path of `theelement 2, and when the footI2 of the explorer Imeets with an obstruction,V the explorer Iisarrested against the action ofthe spring I3; `but when the obstructionis removedthe spring I3 restores the foot I2 to its normal extendedrelation with respect to the lower end of the element 2.I The outer sideedge of the shank I I, intermediate the ends thereof is formed with'adepression I5 for a purpose to be referred to. Integralwith lthe body ofthemachine is a lugIIV 'formed vwith an axial passage I8 4which opensinto the depression fr. The depression I5 is in the form of a camsuriace.-` The lug `I'iwis disposed at right ,the element 2.

angles to the shank I0. Slidably mounted in the passage I8 is a circuitcloser I9, for a circuit to be referred to. The closer I9 is of greaterlength than the length of the lug II. The outer side edge of the shankII is indicated at 20 and it operates on the closer I9 in a manner to bereferred to.

The explorer I0 is bodily carried upwardly with the element 2 againstthe action of the spring i3, by what is termed an explorer liftingmember or trip-carrier indicated at 2 I. The member 2| consists of aplate 22 having a horizontal top edge 23 and a pair of rounded lowercorners 24. The width of the plate 22 corresponds to the width of theelement 2. The upper terminal portions of the side edges of the plate 22are formed with oppositely extending right angularly disposedprotuberances 25, 26 of substantially triangular form having theirhorizontal edges flush with the edge 23. The plate 22 below itshorizontal median and on its vertical median is pivotally connected tothe outer face of element 2, as at 21.

The body portion 28 of the stitching unit or head of the machine hasextending from the front thereof an upper and a lower outwardly directedstud 29, 30 respectively disposed in superposed aligned relation Theelement l2 has its outer face formed with an outwardly directed stud 3|arranged above and to one side of the pivot 21.

With reference to Figure 2 the explorer I0 is shown with its vfoot I2 infull lines in extended relation with respect to the lower end of theelement 2 and when in such position the stud 32, full line showing isarranged over and in the upward path of the protuberance 26. In Figure 2the member 2I is shown in full lines at the start of its lifting strokeand when so arranged the protuberance 25 is seated on the stud 3 0. Thefull line showing of the member 2l is at the limit of the downstroke ofthe element 2. As element 2 moves upwardly it carries member 2Itherewith and the protuberance 26 will engage the stud 32 and lift theexplorer IU against thelaction of the spring I3. When the 'member 2l isVmoved to the dotted line position shown in Figure 2 the protuberance 25abuts stud 29 whereby member 2I will be canted or tilted to the dottedline showing (Figure'l) thereby releasing spring I3 which acting on theexplorer I0 will shift the latter to dispose its foot I2 in extendedrelation with respect to the lower end of The release of the explorer I0from lifted position is had before the completion of the upstroke of theelement l2. The operation just, referred to will be had during thenormal operation of the machine, that is to say when the explorer I0 hasnot met with an obstruction in the path of the operative stroke of theelement 2. After the member 2I has been tilted or canted it will becaused to assume the full line position transversely of the element 2due to the action of the stud 30 relative to the protuberance 25 on sothe'latt'er will perform itsdriving function shifts the braking means toactive position. The i120 element comprises a pair of oppositelyextending arms 35, 31 disposed in angular relation and merging at theirinner ends'into each other is a'laterally dispo-sed arm 38. The arms 36,31

through the upper end of the arm 36 and it is formed in a manner to notonly connect it to arm 36 but also to lconnect the roller 4| thereon.The roller 4| is disposed at the forward end of the extension 39. Theroller 4| is to bear against a stretch of the belt 6, as shown in Figure1 for the purpose of tightening the belt to have the latter perform itsdriving function. The roller 4|, with the element 35 is shifted in onedirection of its movement by its controlling spring, is

moved clear of the belt 6 and under such conditions the belt 6 will notperform its driving function. The mannery in which the roller 4| isshifted from off of 4the belt 6 will be referred to. The arm 35 ofelement 35 extends above the driven pulley 5. The arm 31 of element 35depends below the driven pulley 5. 'I'he disc 33 is arranged on theshaft? 4 between the driven pulley 5 and the element 36. Connected tothe body of the machine is a stud 42 to which is attached thecontrolling spring 43 for the element 35.

The spring 4.3 is connected to the lower end of the arm 31 of theelement 35 and normally tends to move the roller 4| from belt tighteningposition, such as shown in .Figure 1.

The br-akingmeans referred to is indicated at 44 and it is soV relatedto the pulley 5 for applying a braking action thereon When the belt 6has been made inactive on the moving of the roller 4| clear of the belt.The braking means 44 includes an Vupstanding normally outwardly inclinedlever arm 45 pivotally mounted at its lower end, as at 46 and having itsupper end, as at 41 pivotally connected to an end of a pull bar 43. Thelatter at its other end is pivotally connected, as at 49 to the arm 36of element 35. The lever 45 intermediate its ends is provided with abrake shoe 50 for application to the pulley 5 when the element 35 isshifted in a direction to release the drive of the lbelt.

Under normal operating conditions of the machine the element 35 land thebraking means 34 will appear as shown in Figure l, but when an obstacleis discovered in the operative path of element 2 by the explorer ID, thecontrol is provided with means associated with element 35 which willautomatically provide for releasing the belt in -a manner relative tothe pulley 5 to arrest the driving thereof and further to cause element35 to applythe braking means 44 tosuch pulley. The parts of the controlwhich are assoand 33 are termed respectively upper, lower and 15 ciatedwith ek'plorerl and element 35 to provide formaking Ithe belt Vinactive'relative to pulley 5 and yto Vapply the braking means will now bereferred to. Y

Removably seated on the outer end of the arm 38 of the element 35 is theupper end of a shiftable latching lever 5| for the element 35. Whenlever 5| is released the controlling spring 43 shifts the element 35 ina direction to move the roller 4| clear ofl the belt 6 and the bar 48 ina direction to move lever 45 in a manner to apply the brake shoe 55 tothe pulley 5, under suchconditions` arresting the operation of thedriven structure of a machine. The lever 5| is upstanding and pivotallymounted intermediate its ends, las at 52. The lever 5| is shifted in adirection to release the element 35 by a solenoid 53 having its coreindicated at 54. The latter is provided with a head 55. The lower end ofthe lever 5| is connected with the head 55 by a link 55, which ispivctally connected as at 51 to lever 5| and at 58 to the head 55. Acontrolling spring for lever 5| is indicated at 58- and it is connectedto the body of the machine and to the lower end of lever 5I. Thesolenoid 53 is I normally deenergized.

Secured to the body of the machine in proximity to the disc 33 is anormally open contact device 65 interposed in a solenoid circuit 6|.TheA device 63 consists of a pair of resilient suspensions 62, 63 for apair of contacts 64, 55. The device 65 is intermittently closed. Thesuspensio-n 62 carries a circuit closer 66 engageable by the cam 34 toprovide for the abutting of the ccntaicts 34, 65 to close device 60.Arranged adjacent to the lug |1 is a normally closed contact device 3.'and which is closed by means of the circuit closer I3 engaging with theedge 20 of shank `The device 61 consists of a pair of resilientsuspensions '68, 69 carrying contacts 15, 1|. The normal position of thecontact device 51 is `as shown in Figure 1 and this statement applies tothe ycloser I3 when the machine is operating under normal conditions.The closer I9 when the machine is in normal operating condition isforced by the suspension 68 into the cavity or cam I6 formed in theshank l of the explorer lil. When the latter meets with an obstructionits downward movement is arrested against the action of its controllingspring whereby the closer I5 is held outwardly by the edge 25 of shankto maintain contact 1B in engagement with the contact 1| whereby, whencontacts 64, 65 are engaged due to the action of cam 35 the solenoidicircuit 6| will be closed, the solenoid energized and its core 54 willa-ct to shift the lever 5| in a direction to release the element 35 andthe latter will act in a manner to move the roller 4| from engagementwith the belt 6 and apply the braking means which results in `theinactivity of the driven structure of the machine. v

With reference to the-modified form of safety control shown by Figures 5to 11, the driving Iand driven structures ofthe machine with which suchform of control` is installed with are generally indicated at 15, 1|respectively. Withreference to Figure 5, the driving structure 15, asshown, includes an electric motor 12, a peripherally grooved drivingVpulley 13 on the motor shaft 14, a peripherally grooved driven pulley15 having a hub 16 extending rearwardly therefrom and a driving `beltTileading from the pulley 13 to pulley `15.. With reference to Figure5,1the driven structure 1|, as shown, includes anl operating shaft 18formed of forward rear portions lof' different diameters, the `forwardportion is of larging sockets |05. 'Ihe hub |05 is of a length less estdiameter and indicated at 10 and the rear portion is of smallestdiameter and `:indicated at 80. The junction of the shaft portions 10,80

provides the shaft 18 with a peripheral shoulder SI. The shaft portion19has secured to its forward end a means, indicated at 82 for operatingreciprocatory parts, not shown-of the driven structure. These parts byway of example will be the staple forming and driving elements of a wirevstitching machine. Secured upon shaft portion 19 is a collar 83 formedat its rear end with an annular peripheral flange v84 which is flushwith the shoulder 8|. Secured upon the shaft portion 80 is a bearingsleeve 85 which at'its forward end abuts the shoulder 8| and the collar'83. The forward end of sleeve 85 is formed with an annular peripheraltoothed flange 86 of materially less diameter than and abutting theinner part of flange 84. The shaft 18 is mounted in the body part 81 ofthe stitching head of the machine. The part 81 has its front portion 88of greater height than its rear portionf. The portion 88 is disposedtoextend above and to depend below the portion 80. The shaft 18 extendsrearwardly from body portion 89.

The hub 10 of pulley 15 is mounted on sleeve and abuts the rear face ofange 86. The flange 84 has pivoted thereto the ordinary springcontrolled clutching pawl 90 of known form for engagement in the teethvof the ange 85 for releasably clutching the driving structureto thedriven structure.

With reference to Figure 5 there is'mounted on shaft portion 80 andabutting the rear end of sleeve 85 a disc 9| formed with an axialopening 02. The disc 9| is secured to the rear end of sleeve 85 by thecountersunk holdast means 03 whereby the disc 0|, sleeve 85 and shaft 18will bodily rotate together. A retaining means 94 for the disc 9| abutsthe latter and is secured to shaft portion 85. The body of disc 9| inproximity to its outer edge is formed with a socket 95 which registerswith the mouth of a socket 96 formed in the hub 16. Positioned in thesockets 95, 56 is a pin 01. for coupling the pulley 5 with the disc 0|whereby on the-operation of pulley 15 the driven structure 1| will beoperated from the driving structure as long as the pin 91 is in itscoupling positionoruntil the pin is sheared.

With reference to Figure 1 the drive pulley of the structure 10 whichcorresponds to the pulley shown by Figure 5 is indicated at 90 and itshub at S3. The pulley -08 and its hub 09 is set up relative to thesleeve 85 in the same manner as the pulley 15 and the hub 16 of thelatter. The disc (Figure '1) which corresponds tothe disc 0| (Figure 5)is indicated -at |00 is not formed with a socket, such as the-.socket 95in disc 0|, but in lieu thereof it is provided on its inner face with asemi-spherical cavity 10| to receive the ball of a spring controlledball clutch structure |02 mounted inasocket |03 formed in the hub S0 ofpulley 08. The ball clutch struc ture, when active in connection withthe cavity |0| provides for the operation of the driven structure fromthe driving structure as long as `clutch |02 is active. The hub SQis notprovided with the socket 95. The ball clutch structure functions for thesame; purpose as the pin: 91.

With reference to Figures '8 .and 9, the drive pulley and its hub of thedrivingstructure are indicated at |04, |05 respectively. `The hub |05 isIiormed with a plurality 'of vrearwardly openthan sleeve 85. The .disc(Figure 8) which corresponds to disc 9| or |00 isindicated at |08.Positioned between the hub |05 and disc |08, as well as encompassing apart of sleeve is a frictional clutch structure |00 of the disc typeincluding an annulus H0 positioned against the hub |05. The annulus H0carries studs H| land pins H2. The studs |H extend into the sockets |06and bear against springs H3. 'Ihe pins HI engage in the disc-like partsH4 of the structure |09. The latter provides for coupling the drivenstructure to 'the driving structure. The disc |08 is not formed with asocket or a cavity.

Otherwise than as Vstated with respect to Figures '1, 8 and 9 thedriving and driven structures will be the same asthat shown by Figure 5.

With reference to Figures 10 and 11 the Operating shaft of the drivenstructure is indicated at H5 and it is of thebreak type formed of afront and rear section IB, H1 respectively. The section H5 is what maybe termed a driver for thesection H1. The section H6 is to be connectedto a prime mover not shown. There is associated with the shaft sectionsH6, H1 a single tooth spring clutch H8 to provide for the operating ofsection H1 from section H5.

The modied form of safety control shown by Figures 5 and 6 includes asegmental shaped abutment H9 secured to the rear face of a revolubledisc |20 forming an element of the means 82, a pivoted normally latchedcombined impact receiving and arresting element |2| for coaction withthe abutment H9, an explorer |22 and a spring urged carrier |23 for theexplorer |22 and which also acts as a latch for the element |2 The frontportion 88 of the body part of the stitching head is formed with an openfront chamber |24, an upper vertically disposed guide opening |25communicating at its lower end in the upper portion of chamber |24, arecess |25 in the top wall of 'chamber |24, a groove |21 in the said topwall opening into the recess |25, the chamber |24 and the lower end ofguide opening |25, and a lower vertically disposed guide opening |20communicating atits upperv end with the chamber |24. The guide openings|25, |28 are arranged in inner endwise aligned position. The wall ofopening |25 at its upper portion is threaded and engaging with suchportion is a threaded closure |29 for closing the upper end of suchopening and which also acts -as ar abutment.

The element |2| comprises a pivotally suspended one-piecebody E35 formedof a depending incurved arm |3| and a horizontally dislposed arm |32which is integral with the upper end of arm |3| and extends'laterallyfrom the latter. The arm |3i is of greater length than arm |32 and it isformed with a substantially quadrangular shaped lower portion |33 and eflared upper portion |355 of greater length than portion |32. `The lowerend ofportion |34 is of less width than the upper end of portion |33 andit is spaced from the inner side edge ol portion |33 to thereby providethe upper end of the latter with a part |35 oi'set with respect to saidportion |34. The part |35 may be termed a nose adapted to be shiftedinto the part of and capable of being impacted upon by the abutment H9.The said portion |34 constitutes a combined stop and arrester. The upperportion of the arm |3| extends into the recess |25 and it is apertured,-as at |36 for mounting on a pivot |31. The `arm |32 is tapered and Visdisposed in the recess |26 and extends through groove |21 into the guideopening |25. The element |2| is arranged rearwardly of the disc and isso y merges into a foot' |39 disposed in the operative path oi areciprooatory element of the driven structure. The foot |39 is disposedat right angles to the shank |38.

The carrier |23 includes a body part formed of a horizontally disposedupper portion |4|, a vertically disposed intermediate portion |42integral with and depending from the outer end of portion |4| and adepending incurved lower portion |43 merging at its upper end into thelower end of portion |42 and at its lower end into one side of the upperend of shank |38. The portion |4| extends inwardly beyond the lowerendof the portion |43. Formed inftegral with the top of the portion |4| isthe lower end of a vertically disposed head-piece |44 extended into thelower portion of the opening and formed lengthwise thereof with aperipheral cut-out |45 having an upper wall |46, a lower wall |41 and apair of side walls |48. The outer or free end of the arm |32 of element|2| is arranged in the cut-out |45. The head-piece 44 is arranged inalignment with the shank |38 of the explorer |39. The carrier |23 isspring urged and for such purpose-a coiled spring |49 is arranged in theopening |25 between the headpiece |44and the closure |29. The action ofthe spring |49 is to normally position the foot |39 in extended relationwith respect to the lower end of the reciprocating element of the drivenstructure. 'Ihe lowered position of the carrier |23 provided by thespring |49 will cause the upper wall |46 to engage the arm |32 and latchelement |23. 'Ihe latched position of element |23 will be such that theoff-set part |35 of such element will be clear of the abutment ||9whereby the operation of themachine will not be impaired.

It will be assumed that the foot |39 of the explorer |22 meets with anobstruction in the operative path of the reciprocatory element of thedriven structure then explorer |22 cannot be Vurged by the spring |25 toan extent to latch element |21. Under such-conditions the arm |31 ofsuch elementJ willvnot move outwardly `to an extent to position theoffset part |35 clear of the path of the abutment ||9and as the disc |20is revolving it will cause the abutment ||9 to impact the offset part|35 whereby the latter will arrest the operation of the shaft of thedriven structure resulting in thestalling of the motor or the impairingof the clutching connections, between the driving and driven structuresto an extent to stop the operation of themachine. v

The modified form ofsafety control Figures 12 `to 1'7 is shown by way ofexample in connection with a wire stitching machine |50 ofthe stapleforming and driving type. The machine |56 includes a driven structure|5| including as a part thereof a reciprocatory means |52 such as astaple forming element. The structure |5| is operated from a drivingstructure or prime mover |53 which is adapted to be clutched to thestructure |5| by a clutch structure |54 formed of a clutch member |55iixed to the driving structure and a spring controlled clutch member |56slidably mounted on the operating shaft |51 of the structure |5|. Themember |56 is to normally engage with the member |54 whereby the shaft|51 is driven fromthe structure |53. 'I'he memberl |56L as shownincludes a sleeve |58 provided with teeth for clutching the teeth ofmember |54. Encompassing and fixed tothe sleeve |58 intermediate itsendsis an annular cam element 59 formed on one of its edges with a pair ofcamvsurfaces |60, |5I. The surface |60 is adapted to be engaged by ashifter oi any suitable form and arrangement, not shown which coactsWith the surface |60 for moving sleeve |58 in a direction to unclutchthe driven structure from the driving structure when desired. The camsurface |6| forms a part of the second modified form of control and itis to coact with a normally latched element, to be referred to ofthecontroll for the purpose of unclutching the driven structure from thedriving structure when an obstacle is interposed in the operative pathof the reciprocatory means of the driven structure. The development ofthe cam element |59 is shown by Figure 18.

With reference to Figures 13, 14 and 15 the body of the stitching headof the machine is indicated at |62 and it has slidably mounted thereinmeans |52 which will be termed a staple forming element and whichisreciprocated in a known manner such,'by way of example by the operatingmeans |63. It is well known that the means |63 also operates the stapledrivingelement-of the machine. Means |63 -is operated -by-the shaft |51.The body |62 is formed in its front and at one sideA of the passagewhich element |52 reciprocates with a cut-out |64 of less length thanvsaid bodyand which borders such passage. Arranged in the cut-out |64 isan upper and a lower stud |65, `|66 respectively arranged in superposedspaced alignment. The stud is positioned near vthe upper end of thecut-out |64 and the stud |66 is positioned in proximity to the lower endof the cut-out |64. The element |52 intermediate its ends and in itsfront face is provided witha wide transversely extending groove |61opening at the side Aedges of said element |52'. AThebody |62 isv formedin its front with a vertical-ly disposed channel |68 having the'majorportion of itsy length Vof square cross section and the remainingportion of its length substantially ofcircular cross section. The saidremaining portion of the length of the channel |68 is at the upper endof the Vlatter and'is indicated'at |69 and threaded. The channel |68opens atv the upper and lower ends of the body |62; Interpos'ed betweenchannel |68 and the element |52 iswh'atr may be termed a 'partition |10lcorresponding in length to the body |62. The partition (10 'at' itsfront is cut-lout, as at 1| to form what may be termed agroove forestablishing communication between the passage inwhich element|52reciprocates in the channel |68. The purpose ofthe cut-out or groove |1|will be presently referred to. The upper end of the channel |68 isclosed, by an yinverted plug |12 which also constitutes an abutment.Secured to the front of the body |62 is a front plate |13 which closesthe major portion4 of the passage in4 which travels the element |12, aswell as extending. across the cut-out |64 and the major portion of thelength of the channel |68. 'Ihe means |63 which reciprocates the stapleforming and driving elements includes a disc |14 having its edgeprovided with a cam sufrace |15.

Arranged in the channel |68 and extending from the bottom of the body|62 is a spring urged explorer |16 formed of a shank |11 and a foot |13at the lower end of and disposed at right angles to the shank |11. Thefoot |18 is disposed in the operative path of the element |52. The shank|81 is arranged in the channel |68 and has its upper end provided withan extension |19 of circular cross section. The shank |11 is of squarecontour. The extension |19 is disposed centrally of the upper end of theshank |11. At the point of mergence of the lower end of the extension|19 with the upper end of the shank |11 a peripheral shoulder |88 isprovided, due to the difference in the diameter of the extension |19with respect to the width and the breadth of the upper end of the shank|11. Surrounding the extension |18 and interposed between the shoulder|89 and the plug |12 is a coil spring |8| positioned in the channel |68and permanently tending to urge the explorer |16 in extended relationwith respect to the lower end of the element |52. The normal position ofthe foot |18, due to the action of the spring |8| is at the work line|82. The front of shank |11 between its transverse median and its upperend is provided with a cut-out |83,which opens at the side edge |84 ofthe shank |11. The purpose of the cut-out |83 will be hereinafterreferred to. The other side edge |85 of the shank |11 is formed with anupper and a lower pocket 88, I 81 disposed in superposed relation andseparated by a tapered partition |88 which has its outer end ush withthe edge |85. The pocket |88 is of less length than and arranged abovethe pocket |31. The pocket |88 is arranged adjacent the cut-out |83. Thepocket |81 has a portion of its length arranged adjacent the cut-out |83and the remaining portion of its length dependingr below such cut-out.The purpose of the pockets |86, |81, as well as the partition |88 willbe referred to.

Arranged in the groove |61 of the element |52 l is a lifting member |89for the explorer |16. The member |89 consists of a plate |98 having astraight top edge |9|, an outwardly inclined side edge portion |92 whichmerges into the remain ing portion of such edge and such remainingportion is straight and indicated at |93. The plate has its other sideedge |84 which inclines outwardly throughout. The edge portion |92 andthe edge |94 are oppositely outwardly inclined. Formed integral with theplate |90 above the edge |94 is an outwardly directed rectangular arm|95. The plate |98 between its vertical median and the arm |95 ismounted on a pivot |96 carried by the element |52. The arm |95 isarranged between the studs |65 and |86. The member |89 is bodily carriedwith the element |52 and it is adapted to extend through the cutout |1|and engage in the cut-out |83. The cutout |83 includes an upper and alower wall |91, |98 respectively. The normal position of the member |89with respect to the explorer |88 is as shown in Figure 13. When element|52 moves downwardly it carries the member |89 therewith and as thelatter moves downward it will ride one side against the shank 11 andclear the upper portion of such shank and extend into the cut-out |83.When member |89 extends into the cut-out |83 it will be disposedhorizontally. It will be assumed that the machine is operating undernormal conditions and that the parts are as shown in Figure 13 and whenin such position the explorer |18 is disposed in extended relation withrespect to the element |52. As the element |52 moves downwardly themember |89 is carried therewith and will assume the position heretoforereferred to. It will now be assumed that element |52 has completed itsoperative stroke and starts to move in an upward direction. As element|52 continues to move upwardly the member |89 will engage the wall |91thereby lifting the explorer |18 against the action of the spring |8I.On a continued upward movement of the element |52 with the explorermoving in the same direction against the action of the spring |8I, thewall 91 will provide of the member |89 tilting or canting to theposition shown in Figure 13 whereby the explorer |16 will be releasedand the spring |8| will then act to shift the explorer' |18 in adirection towards the work line |82.

The second modified form of the safety control is so constructed thatwhen the explorer |18 is shifted by the spring |9| towards the work linethat if the explorer |16 meets with an obstruction disposed in theoperative path of the element |52 the operation of the driven structure,which element |52 forms a part of will be automatically discontinued.The means which performs the function just stated is associated with theexplorer |16 and the cam surface |15 of the disc |14 and such meansincludes an upper normally opened contact device |99, a lower normallyclosed contact 288, a solenoid 28|, a solenoid circuit 282, a latchingstructure 283, a spring controlled shifting structure 284 for the clutchmember |56, a circuit closer 285 and a circuit closer 288. The contactdevice |99 is interposed in the solenoid circuit 282. The contact device288 is interposed in the solenoid circuit 282. The device |89 includes apair of depending resilient suspensions 281, 288 provided with contacts289, 2|8 respectively. The circuit closer 285 is associated with thecontact device |99 and it is slidably mounted in the support 2| on thebody of the machine. The closer 285 is associated with the disc |14 andthe cam surface |15 on disc |14 acts to shift the closer 285 to engagethe suspension 281 for the purpose of moving contact 289 into engagementwith contact 2|8. The contact device 288 includes a pair of dependingresilient extensions 2|2, 2|3 provided with contacts 2|4, 2|5respectively. The circuit closer 288 coacts with the device 282. Thecloser 286 is slidably mounted in the groove 2|6 formed in the body ofthe machine and it is associated with the partition |88 whereby when itis engaged by such partition it will act on the suspension 2|2 toprovide for the engagement of the contacts 2 |4, 2|5 as shown in Figuresl2 and 13.

The solenoid 28| is normally energized and its core is indicated at 2|1.The core 2|1 is provided with a head 2|8 connected with the latchingstructure 283. The connection between the core 2|1 and the latchingstructure 283 consists of a link 2| 9, pivotally connected as at 228 tothe head 2|8 and as at 22| to the latching structure 283. The latterconsists of an upstanding bell crank levez- 222 formed of a dependingarm 223 and a horizontally disposed arm 224. The latter extendslaterally from the upper end of the arm 223. At the point of mergenoebetween the arms 223, 224 the lever 222 is mounted on a pivot 225.

The spring controlled shifting structure 284 consists of a verticallydisposed plunger 226 formed at its upper end with a nose 221 having arounded surface 228 and an oppositely inclined surface 229 for engagingwith the cam surface |6|. The plunger 225 is slidably mounted in avertically disposed channel 230 formed in the machine body (Figure 12)and it is provided with a laterally extending pin 23| which extendsthrough a slot 232 formed in the machine body (Figure l2). The slot 232opens to the channel 230. The pin 23| constitutes what may be termed akeeper. The plunger 226 is formed with a socket 233 which opens at itslower end. The channel 23|) at its lower end is closed by a removableplug 234 which constitutes an abutment. Interposed between ythe plug 234yand extending into the socket 233 is the controlling spring 235 for theplunger 226. The function of ythe spring 235 is to project the plunger22'0- in a direction to coact with the cam surface |61 on element |59for the purpose of the nose 221 to coact with the cam `surface |6| toshift the clutching member |56 from Iclutching engagement with themember |55 to thereby'discontinue the operation of the driven structure|5|. The solenoid 20| when energized retains the latching structure 203in engagement with the pin 23| to thereby releasably retain the plunger226 in its retracted position, such as shown in Figurel l2. Whensolenoid 251| is de-energized, which action will take place when theexplorer meets with an obstruction in the operative path' of element|52, the latching structurel 2113 will be in released position and theaction of the spring 235 will project the plunger 226 to 'act on the camsurface |6| and move the member |56 from clutching engagement with themember |55.

The operation of the control is so timed that when the explorer |16meetswith an obstruction the contact device 99, as well as the contactdevice 209 will be opened under such conditions opening the solenoidlcircuit 292 resulting in the de-energizing of the solenoidandpermitting of the activity of the spring 235. When the explorer |16meets with an obstruction the circuit closer 20S will be shifted Aby thesuspension 2|2 into the pocket |81 and at this time as the closer 265 istraveling on what may be termed the low part of the edge of the disc|14, due to the action of the suspension 261, both contact devices willbe open resulting'in the opening of the solenoid circuit.

The second modified form of the shifter control also provides for theexplorer acting to automatically discontinue the operation of the drivenstructure from the driving structure when the explorer is shifted .tobeyond 'the work line, that is to say when there is no Work on the worktable to be operated upon by the element |52. When the explorer |16 isshifted below the work line, by the spring 18| the closer 206 will beshifted by the suspension 212 -into the pocket |36 and at this time asvthe explorer 205 is traveling on the low part of the edge of the disc|14 and held in vsuchposition by the suspension 201 both contactdevices. will be open resulting in the opening of the solenoid circuitwhereby the solenoid will be de-energized and the spring 235 willperform its function to position the plunger 226 to engage the camsurface |5| and shift the clutching member |53 from clutching engagementwith the member |55 resulting in the discontinuingof the operation ofthe driven structure.` Y

The modified form of safety control 236 shown byvFigures 19 and 20 isdesigned primarily for use inl connection with the spring controlledplunger 584, Figure 12, of my copending application, Serial No. 267,739,filed April 13, 1934. The said plunger 584 formsy an element of a wirestitching machine and is normally latched. The plunger 584 is forcorrelation with the spring controlled clutching pawl 564 shown in theaforesaid application. The pawl 564 acts to clutch a driving means to adriven means to operate the latter. The plunger 584, when releasedimpacts the pawl 564 and acts to hold it clear of the driven means toprevent operation of the latter from the driving means. VThe pawl 564 iscarried by the driven means, at one end thereof and is to coact with aratchet at that end of the driving' means which opposes the said end ofthe Vdriven means. The driving means, ratchet and the pawl referred toare not shown by Figures 19 and 20. Although the safety control 235disclosed by Figures 19 and 20 is designed primarily for use inconnection with the plunger 584, it is to be understood that suchcontrol is for employment in any connection for which it may be foundapplicable.

The safety control 236 is shown in connection With a wire stitchingmachine of that type including a staple forming and a staple drivingelement. but they are operated from an actuating means 231 carried bythe driven means or structure 238 of the machine. A portion of the bodyof the wire stitching'machine is indicated at 239 and it includes acasting 249 formed with an open front chamber 24| and a depending hollowpart 242. The operating means 231 referred to is arranged Within thechamber 24| and it is at the forward end of the driven structure 238which-has aportion thereof journalled in the back of the cas-ting 240. Avertically disposed passage 243 is formed in the back of the casting 246and it opens at its` lower end through a transversely disposed wallportion 244 arranged in parallel spaced relation to the bottom wall245of chamber 24|. The passage 243 is closed at its upper end by -aremovable threaded plug 246. The casting 24|]V is formed with avertically disposed opening 241 communicating at its upper end with thechamber 24| and opening at its lovver end into a chamber 248.

The opening 241 constitutes a guide passage for a purpose to be`referred to. The chamber 243 is closed at its front, open at its bottomand also open at its rear. The portion 242 at its front has a dependingpart 249 which is cut to form a clearance. The portion 242 `is also cutout as Iat 25|) lto establish communication between the chamber 248 andthe opening 241. The operating means 231 includes a disc 25| having itsedge formed with a cam surface 252 which is of less length than thecircumference of disc 25|. Arranged Within the passage 243 is avertically disposed spring controlled plunger 253. The controllingspring for plunger 253 is indicated at 254 and it is arranged within thepassage 243 between the upper end of the plunger 253 andthe inner end ofthe plunger 245. The spring controlled plunger 253 constitutes a pushingmeans for a purpose to be referred to.

Arranged within the ychamber 24| is a latching lever 255 which isassociated with a spring controlled plunger 256. .The latter correspondsto the plunger 584 disclosed by my copending application aforesaid. Theplunger 256 extends through the body 239 of machine and also The sai-delements are not shown,

through the casting 246 into the chamber 24|. The plunger 256 has thatend terminal portion thereof arranged in the chamber 24| and indicatedat 251 threaded. Threadably engaging with the end portion 251 of theplunger 256 is an annular abutment 258 which is retained on the plunger256 by a holding nut 255. The plunger 256 is normally latched inretracted position and when in such position the abutment 258 will bearranged as shown in Figure 19 and which is in spaced relation to thewall portion 266 of the chamber 24|.

The lever 255 is substantially of the bell crank type and includes anarm 26| which is disposed substantially horizontally and an upstandingarm 262. The latter is of less length than the arm 26|. The arm 262carries a stub shaft 264 at its upper end provided with a roller 265arranged in the path of the cam surface 252. At the point of mergence ofthe arm 26| with the arm 262 the lever 255 is mounted on a pivot 266extended from the wall forming portion 266 of the chamber 24|. The arm26| of lever 255 includes an inner inclined part 261 and an outerinclined part 268. The part 268 extends downward in connection from thelower end of the part 261. The part 268 at its outer end is formed withan arcuate groove 266 which opens at its lower edge and such groove isarranged, when the plunger 256 is in the position as shown in Figure 19,directly over the plunger between the wall forming portion 266 and theabutment 258. The lever 255 normally is in the position shown in Figure20 for the purpose of latching the plunger 256 in its contractedposition. The part 26| of the lever 255 is arranged directly below thelower end of the plunger 253 and the latter bears on the edge part 216of the lever 255 for normally forcing the arm 26| -downwardly and actsto hold the lever 255 in overlapping relation with respect to theplunger 256 until the downward movement of the lever arm 26| isarrested. The cam surface 252 acts on the roller 265 to rock lever 255in a direction to elevate the arm 26| against the action of the springcontrol plunger 252 but complete removal of lever 26| from latchingposition relative to plunger 256 is not had unless a foreign object isinterposed in the path of the explorer 21| to be more fully A referredto.

Travelling in the opening 241 is a vertically movable plunger 212 formedwith a groove 213 on one side of its upper end. Slidably arranged ingroove 213 is a roller 214 carried by the part 268 of the lever arm 26|whereby plunger 212 is slidably connected to and is bodily carried bythe lever arm 26|. The plunger 212 is provided with teeth 215 for apurpose to be referred to. The plunger 212 is moved downwardly by thelever arm 26| and when the explorer 21| meets with an obstruction theplunger 212 will be held in the dotted line position shown in Figure 20,thereby arresting the lowering of lever arm 26|, see dotted lineposition of lever, Figure 20 whereby the lever 255 will be held clear ofthe plunger 256 and release the latter so it will act on the clutchingpawl to disconnect the driving means from the driven means anddiscontinue the operation of the machine.

The explorer 21| includes a shoe 216 which is to be disposed in theoperated path of the staple forming element of the wire stitchingmachine. The teeth of the plunger 212 engage a gear 211 rotatablymounted in the portion 242 of the casting 246. The gear 211 acts as oneof the pivots of a pantograph of which the shoe 216 forms the connectinglink between the two swinging arms 218, 219. The other pivot of thcpantograph is indicated at 286. If the shoe 216 meets an interferenceduring its downswing, in the operated path of the staple forming elementit will provide for the parts correlated therewith to act on the lever255 to prevent it from latching to the plunger 256 whereby the latterwill be released and will perform, when in its projected position, thefunction to provide for the clutching lever being moved to a positiondisconnecting the driving means from the driven means.

What I claim is:

1. In a safety control for the purpose set forth a normally spring urgedoppositely movable explorer adapted for disposing in the operative pathof an oppositely movable driven element, and a trip-carrier adapted tobe pivotally mounted on and bodily carried with said element for movingsaid explorer in one direction a predetermined extent against the actionof its urging spring, said carrier having a laterally extendingprotuberance at its top, said explorer having a stud correlating withsaid protuberance to provide for such movement of the explorer by thecarrier.

2. In a safety control for the purpose set forth a normally spring urgedoppositely movable explorer adapted for disposing in the operative pathof an oppositely movable driven element, a tripcarrier adapted to bebodily carried with said element for moving said explorer in onedirection a predetermined extent against the action of its urgingspring, said carrier and explorer having correlated parts to provide forsuch movement of the explorer by the carrier, a driving means for saidoppositely movable element, controllable means for said driving means,and said driving means and said explorer having means correlated withsaid controllable means made active, when said explorer meets with anobstruction in said path for discontinuing the operation of said drivingmeans.

3. In a safety control for the purpose set forth a normally spring urgedoppositely movable explorer adapted for disposing in the operative pathof an oppositely movable driven element, a trip-carrier adapted to bebodily carried with said element for moving said explorer in onedirection a predetermined extent against the action of its urgingspring, said carrier having a laterally extending protuberance at itstop, said explorer having a stud correlating with said protuberance toprovide for such movement of the explorer by the carrier, said carrierhaving another laterally extending protuberance at its top, meanslocated adjacent to said element and coacting with the said anotherprotuberance for shifting the carrier clear of said stud to release theexplorer, and means for pivotally connecting said trip-carrier to saidmember.

4. In a safety control for the purpose set forth a normally spring urgedoppositely movable explorer adapted for disposing in the operative pathof an oppositely movable driven element, a tripcarrier adapted to bebodily carried with said element for moving said explorer in onedirection a predetermined extent against the action of its urgingspring, said carrier and explorer having correlated parts to provide forsuch movement of the explorer by the carrier, a driving means for saidoppositely movable element, controllable means for said driving means,said driving means and said explorer having means correlated with saidcontrollable means made active, when said explorer meets with anobstruction in said path for discontinuing the operation of said drivingmeans, and means for pivotally connecting the trip-carrier to saidelement.

5. In a safety control for the purpose set forth a normally spring urgedoppositely movable explorer adapted for disposing in the operative pathof an oppositely movable driven element, a trip-carrier adapted to bebodily carried with said element for moving said explorer in onedirection a predetermined extent against the action of its urgingspring, said carrier and explorer having correlated parts to provide forsuch movement of the explorer by the carrier, a driving means for saidoppositely movable element, controllable means for said driving means,said driving means and said explorer having means correlated With saidcontrollable means made active, when said explorer meets with anobstruction in said path for discontinuing the operation of said drivingmeans, and spaced stops located adjacent to said element for correlationwith the carrier.

6. In a safety control for the purpose set forth a normally spring urgedoppositely movable explorer adapted for disposing in the operative pathof an oppositely movable driven element, a tripcarrier adapted to bebodily carried with said element for moving said explorer in onedirection a predetermined extent against the action of its urgingspring, said carrier and explorer having correlated parts to provide forsuch movement of the explorer by the carrier, a driving means for saidoppositely movable element, controllable means for sai-d driving means,said driving means and said explorer having means correlated with saidcontrollable means made active, when said explorer meets with anobstruction in said path for discontinuing the operation of said drivingmeans, means for pivotally connecting the tripcarrier to said element,and spaced stops located adjacent to said member for correlation withthe carrier.

7. In a safety control for the purpose set forth a normally spring urgedoppositely movable explorer adapted for disposing in the operative pathof an oppositely movable driven element, a tripcarrier adapted to bebodily carried with said element for moving said explorer in onedirection a predetermined extent against the action of its urgingspring, said carrier and explorer having correlated parts to provide forsuch movement of the explorer by the carrier, a driving means for saidoppositely movable element, an electrically controlled controlling meansfor said driving means, and said driving means and said explorer havingmeans correlated with said electrically controlled controlling meansmade active, when said explorer meets with an obstruction in said pathfor discontinuing the operation of said driving means.

8. In a safety control for the purpose set forth, a normally springurged oppositely movable explorer adapted for disposing in the operativepath of an oppositely movable driven element, a tripcarrier adapted tobe bodily carried With said element for moving said explorer in onedirection a predetermined extent against the action of its urgingspring, said carrier and explorer having correlated parts to provide forsuch movement of the explorer by the carrier, a driving means for saidoppositely movable element, controllable means for said driving means,said driving means and said explorer having means correlated With saidcontrollable means made active, when said explorer meets with anobstruction in said path for discontinuing the operation of said drivingmeans, and the said controlling means having as a part thereof a brakingmeans for said driving means.

RUDOLPH E. ZERUNEITH.

